CoCO₃ with high theoretical capacity has been considered as a candidate anode for the next generation of lithium-ion batteries (LIBs). However, the electrochemical performance of CoCO₃ itself, especially the cyclic stability at high current density, hinders its application. Herein, pure phase CoCO₃ particles with different particle and pore sizes were prepared by adjusting the solvents (diethylene glycol, ethylene glycol, and deionized water). Among them, CoCO₃ synthesized with diethylene glycol (DG-CC) as the solvent shows the best electrochemical performance owing to the smaller particle size and abundant mesoporous structure to maintain robust structural stability. A high specific capacity of 690.7 mAh/g after 1000 cycles was achieved, and an excellent capacity retention was presented. The capacity was contributed by diverse electrochemical reactions and the impedance of DG-CC under different cycles was further compared. Those results provide an important reference for the structural design and stable cycle performance of pure CoCO₃.

具有高理论容量的CoCO ₃被认为是下一代锂离子电池（LIB）的候选阳极。然而，CoCO ₃本身的电化学性能，特别是高电流密度下的循环稳定性，阻碍了其应用。在此，通过调节溶剂（二甘醇，乙二醇和去离子水）来制备具有不同粒径和孔径的纯相CoCO ₃颗粒。其中，CoCO ₃以二甘醇（DG-CC）为溶剂合成的合成物由于具有较小的粒径和丰富的介孔结构以保持稳固的结构稳定性而显示出最佳的电化学性能。在1000次循环后实现了690.7 mAh / g的高比容量，并且具有出色的容量保持率。容量是由多种电化学反应贡献的，并且进一步比较了DG-CC在不同循环下的阻抗。这些结果为纯CoCO ₃的结构设计和稳定的循环性能提供了重要的参考。